Tire Size Box

295/35R24 vs 295/40R24

295/40R24 compared with 295/35R24

+3.6% diameter, 0.0" width

295/40R24 is 33.29" tall vs 32.13". More than the 3% rule of thumb, so check carefully before switching.

32.1"24" rim4.1"11.6" wide
295/35R24 (solid) compared with 295/40R24 (dashed outline), drawn to scale

With 295/40R24 tires, when your speedometer says 60 mph you are really going

62.2 mph

295/40R24 is +1.16 inches (+3.6%) in overall diameter. That is more than the 3% most shops and makers recommend.

295/35R24295/40R24Difference%
Overall diameter32.13"33.29"+1.16"+3.6%
Section width11.61"11.61"0.00"0.0%
Sidewall height4.06"4.65"+0.58"+14.3%
Circumference100.94"104.59"+3.65"+3.6%
Revolutions per mile627.7605.8−21.9−3.5%

Speedometer difference

If your vehicle came with 295/35R24 and you fit 295/40R24, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.7 mph+0.7 mph
30 mph31.1 mph+1.1 mph
40 mph41.4 mph+1.4 mph
50 mph51.8 mph+1.8 mph
60 mph62.2 mph+2.2 mph
65 mph67.3 mph+2.3 mph
70 mph72.5 mph+2.5 mph
75 mph77.7 mph+2.7 mph
80 mph82.9 mph+2.9 mph

Each size on its own

Questions

Which is bigger, 295/35R24 or 295/40R24?
295/40R24 is taller by 1.16 inches (33.29" vs 32.13"). 295/35R24 is the same width.
Can I replace 295/35R24 with 295/40R24?
It is not recommended without checking carefully. The diameter difference is +3.6%, more than the 3% most shops and makers allow. It will throw off the speedometer and may affect ABS, stability control and clearance.
How much will 295/40R24 change my speedometer?
When your speedometer reads 60 mph with 295/40R24 fitted (calibrated for 295/35R24), your real speed is 62.2 mph. Your odometer will under-count miles by about 3.6%.
Will 295/40R24 lift my vehicle?
Ride height changes by half the diameter difference: +0.58 inches of ground clearance at the axle.

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